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NaF NaCl NaBr NaI同族のイオンは原子番号が大きくなるほどイオン半径が大きくなる。中心から離れるほど引き付けられる力は弱くなるので、NaFが最もイオン結合が強く、NaIが最も弱いから。イオン結合が強いほど融点も大きくなるよ❗️

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